Figure 2.
Type I IFNR deletion abrogates IgG class-switch in 4-mo-old BXD2 mice. Representative spleen sections of BXD2, BXD2-Ifnar−/−, and B6 mice were stained with anti-IgM and anti-IgG antibodies as described in Materials and Methods. A, 20× objective lens magnification of images of spleen sections showing the presence of follicles and IgMbright or IgGbright B cells. B, 40× objective lens magnification of images of spleen sections, denoted with respect to the presence of a follicle (FO) whose boundary is denoted by broken lines.